Comment by pino999

I did for a very long time. I only used vanilla vim, a terminal, a couple of core utils, and documentation.

You just learn to memorize a lot, organize and design your code. It feels very similar to learning to navigate a city without map. The map will be in your head. A very similar feeling I had with code bases. I navigated a map, sometimes I knew the route towards a piece of information, sometimes I knew exactly where it was. Sometimes you add a building or a new road, but you all keep it in your head.

Nowadays I use LSP, autocomplete LLM's and what not. Makes things easier and above all faster.

I still can do without, I am just a bit slower. For small changes and simple scripts I fallback to vim. For git I still use the terminal. And I still use a lot of commandline utilities, because each IDE has a zillion of commands that do the same anyway.

For your example, nowadays I would use grep or some modern equivalent to search for definitions. And to be honest, that isn't that much slower. I can have my editor open in tmux tab and in the other my editor. You don't have to jump through files then.